[ios] date format

http://stackoverflow.com/questions/1929958/how-can-i-determine-if-iphone-is-set-for-12-hour-or-24-hour-time-display

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html#//apple_ref/doc/uid/TP40002369-SW1

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